Film gate lock



-Oct. 25, 1.932. .A. KINDLMANN E1' AL FILM GATE Locx Filed Nov. 29. 19293 Sheets-SinaaiI 1 Q ,'1 ATTORNEY Oct, 25, 1932. A. KINDELMANN ET ALFILM GATE LOCK Filed NOV. 29. 1929 3 Sheets-Sheet 2 Oct. 25, 1932. A,KlNDELMANN ET AL 1,884,729

FILM GATE LOCK Filed Nov. 29. 1929 3 Sheets-Sheet 3 INV NToRs Hbf!Kinde/nan.

[wa/dBaco/ng M ATTORNEY Patented Oct. 25, 1932 UNITED STATES.` PATENTOFFICE',

ALBERT KINDELMANN, OF FLORAL PARK, AND EWALD BOECKING, OF BROOKLYN, NEWYORK, ASSIGNORS TO INTERNATIONAL PROJECTOR CORPORATION, F NEW YORK,

N. Y., A CORPORATION OF DELAWARE FILM GATE LOCK Application filedNovember 29, 1929. Serial No.`410,439.

'lhis invention relates to motion picture machines. and moreparticularly to a new .and improved film gate lock.

An object of the invention is to provide a lock for preventing movementof the film gate when the door of the projection head is closed.

Another object is to prevent the door of the projection head from beingclosed when the film gate is in open position.

A further object of the inventionis to provide a positive securing meansfor the film gate to prevent movement thereof during the operation ofthe motion picture machine.

AThe invention is particularly applicable to a motion picturelprojection machine having a film gate, which moves laterally to permitthe insertion of a film, and a door for closing the projection headduring the operation of the machine.

The above objects and others which will be apparent as the/nature of theinvention is disclosed arel accomplished by providing a latch member onthe inside of the door in position to contact with the edge of the filmgate when the film gate is open and to prevent closure of. the door. Thelatch also contacts with the rear surface of the film gate when the dooris closed and thereby positively secures the film gate. in operativeposition. j

The invention also consists in certain new and original features ofconstruction and part thereof, vin which Fig. 1 is an elevation of theprojection head of a motion picture machine constructed in accordancewith the present invention;

Fig. 2 is a horizontal'scction through the film gate and latch member;

Fig. 3 is an enlarged detailed view of the latch member; and

Fig. 4 is a horizontal section through lthe film gate. and latch membershowing the film gate in open position.

Like reference characters denote like parts in the several figures ofthe drawings.

ln the following description and in the claims parts will be identifiedby specific' ner well known in the art. The projection,

head includes upper feed sprocket 13, upper film gate 14'i'ntermittentsprocketA 15, idler sprocket 16, lower film gate 17, continuous drivesprocket 18 and feed sprocket 19, over which the film is threaded in"the 'order named. The projection head is closed by a door 2() which ishinged thereto as by hinge 21 and secured by suitable latch mechanism22. -The particular form of apparatus, however, forms no part of theinvention and will not be set forth in detail.

Film gate 14 comprises a casting 25 (Figs. Qandll) to which pressureshoes 26 are secured in any well known manner and held in engagementwith the film by spring 27. Film gate 14 registers with an apertureplate i11- cluding a housing 80 having film guides 31 sedured thereto.Light .shield 32 may be secured to said housing in alignment withaperture {il-i. Fire gate 34 is slidably mounts ed for movement ingroove 35 in said housine. j

Film gate 14 may be controlled by rod 4() which is slidably mounted inhousing 30 and provided with operating handle 41. This )articular `formof film ofate and a erture -l s plate is disclosed by way ofillustration only and not as a limitation of the present invention.

The film gate lock comprises a'latch member Which is preferably formedof sllghtly resilient materialand secured to the inner `surface of thedoor 2() as by screw 46. Latch member T45 is provided with an inturned-47 contactsivith the rear surface of casting as illustrated in Fig. v2and firmly secures the film gate in that position. Member is preferablyformed sufficientlyv resilient ,to hold the film gate against undesiredmovement While the machine is being operated and to insure the completeclosure thereof.'v

The above described mechanism eliminates any tendency to vibrate whichthe film gate might otherwise have and forms a positive, lock forholding the filmgate in closed .position While the projection machine isbeing. operated. Furthermorqthe latch operates as a safety device forpreventing the operator from closing the door and starting the operation`of the machine Without'first closing the film gate: l l

While certain novel features of the invention have been shown anddescribed and are. pointed out in the annexed claims, it will beunderstood that various omissions, substitutions and changes in theforms and details of the device illustrated and in its operation may 'bemade by those skilled in the art without departing from the spirit ofthe invention.

VVbat is claimed is:

l. In a motion picture machine having a film gateA and la closuremember, means earried by said closure member and engaging said gate frlocking said film gate in closed iA position When said member is closedand for preventing said member from being closed When said' film gate isin openposition.

2. In a. projection head of a motion picture i projection `machine, afilm gate, a closure member for completely closing said projection head,and means carried by said member and engaging said gate for locking saidfilm gate in closed position When said member is closed.

3. In combination With a projection head, a film gate, a door forclosing said projection head, and locking means carried by said) doorand engaging said gate for locking said film gate in closed positionwhen said door is closed. l

4. In combination with a projection head, a film gate, a door forclosing said projection head, and a resilient latch carried by said'door in a position to contact with the rear ("3 surface of said filmgate when said film gate is closed for resiliently securing said filmgate in closed position. i j

5. In a proj ect-ion head, a film gate includ-v f ing a casting, aclosure for said projection head comprising a door and a latch membercarried b .said door and having an intui'ned flange a apted tocontactwith the edge of said castingwhen saidfilm gate .is open for preventingclosure of said door and to contact with the rear of said casting whensaid film gate is closed for loc'llmg said film gate in closed positionduring i the machina ormaloperation of 6. In a projection -h.ead,a filmgateinclud- F ing a casting, .a closure for said projectionhead'comprising a door and a latch member of resilient material carriedby said door and having. an inturned fiange positioned to cony tact with'the edge of s aid film gate when said` "l filmgate is open and-therebyprevent closure of said door,`said flange being adapted to resilientlysecure said film gate in closed position when said door is closed.

ALBERT KINDELMANN. l'EVVALD BOECKING.

